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Leet236.java
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26 lines (26 loc) · 746 Bytes
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/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
public class Solution {
public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
return helper(root,p,q);
}
public TreeNode helper(TreeNode node,TreeNode p,TreeNode q){
if(node != null){
if(node == p || node == q){
return node;
} else {
TreeNode left = helper(node.left,p,q);
TreeNode right = helper(node.right,p,q);
return left != null && right != null?node:left==null?right:left;
}
}
return null;
}
}